1212646644 has 36 divisors (see below), whose sum is σ = 3343966080. Its totient is φ = 367468560.

The previous prime is 1212646639. The next prime is 1212646649. The reversal of 1212646644 is 4466462121.

1212646644 is a `hidden beast` number, since 1 + 2 + 1 + 2 + 6 + 4 + 6 + 644 = 666.

It is an interprime number because it is at equal distance from previous prime (1212646639) and next prime (1212646649).

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1212646599 and 1212646608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212646649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1530724 + ... + 1531515.

Almost surely, 2^1212646644 is an apocalyptic number.

It is an amenable number.

1212646644 is an abundant number, since it is smaller than the sum of its proper divisors (2131319436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1212646644 is a wasteful number, since it uses less digits than its factorization.

1212646644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3062260 (or 3062255 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The square root of 1212646644 is about 34823.0763144212. The cubic root of 1212646644 is about 1066.3786048091.

The spelling of 1212646644 in words is "one billion, two hundred twelve million, six hundred forty-six thousand, six hundred forty-four".